Appropriate size: each of the brain stress balls measures . 7 cm/2.76 inch long, the right size fits grip and grip, suitable for most teenagers and adults to play and give people endless funSufficient quantity: you will get 12 pieces of brain-shaped stress balls, quantities to place them at, in the office, in your car or at school to release your stress anytime, and also perfect for training your hands and increasing your grip strength, muscle training, and moreQuality materials: these fun stress balls for adults are made of quality polyurethane material, without filling, not easy to break, fun to twist and stretch, good elasticity, can be pressed repeatedly and no irritating smell, suitable for all kinds of hand shapes and can be applied for a long timeStress and ANXIETY RELIEF: These fun stress reliefs are perfect for relieving tension, stress or anxiety, by pressing them you can vent your emotions and by pressing them to improve concentration and relax your mind and bodyGreat gifts: the flexible brain toys are a fun and thoughtful gift for your friend, family, loved ones, colleagues and more; In addition, they can also be used as Halloween prank props, stocking stuffers, party favors, carnival prizes, school prizes, classroom rewards and so onColor RedMaterial: PolyurethanePackage Contents:12 x Brain Stress Ball Only the above package contents, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The permissible measurement error is +/- 1-3 cm.